政治关系在不同历史阶段的表现是什么?

With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野

物质生产对于发展人际关系的作用主要表现在哪些方面?

人际交往具有哪些和极的正面功能?

简要评述人际关系认识平衡理论。

Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.

Double Eagle in the first transatlantic balloon, was greeted by avid crowds in France.

By the nineteenth century, embroidery on men's clothing had virtually disappeared except for the occasional decorative vest and tie.

名词解释：对抗关系